Render a single field of an entity

render-a-single-field-of-an-entity.php

use Drupal\node\Entity\Node;
 
$render = [];
$entity_type_manager = \Drupal::entityTypeManager();
$entity = $entity_type_manager->getStorage($entity_type)->load($entity_id);
$fields = [
  'body',
  'field_example'
];
if ($entity) {
  $display = $entity_type_manager->getStorage('entity_view_display')->load($entity_type . '.' . $entity->bundle() . '.' . $view_mode);
  $view_builder = NULL;
  foreach ($fields as $field_name) {
    if (isset($entity->{$field_name})) {
      $component = $display->getComponent($field_name);
      if ($component) {
        if ($view_builder === NULL) {
          $view_builder = $entity_type_manager->getViewBuilder($entity_type);
        }
        $render[$field_name] = $view_builder->viewField($entity->{$field_name}, $display->getComponent($field_name));
      }
    }
  }
}

//or

$build = $entity->field_example->view('teaser');